As discussed on the phone, I'd like your thoughts on the...

src/assembler.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 411 matching lines @@
   static ExternalReference the_hole_value_location();
 
   // Static variable StackGuard::address_of_limit()
   static ExternalReference address_of_stack_guard_limit();
 
   // Function Debug::Break()
   static ExternalReference debug_break();
 
   // Static variable Heap::NewSpaceStart()
   static ExternalReference new_space_start();
+  static ExternalReference heap_always_allocate_scope_depth();
 
   // Used for fast allocation in generated code.
   static ExternalReference new_space_allocation_top_address();
   static ExternalReference new_space_allocation_limit_address();
 
   // Used to check if single stepping is enabled in generated code.
   static ExternalReference debug_step_in_fp_address();
 
   Address address() const {return address_;}
 
@@ skipping 25 matching lines @@
 static inline bool is_uint4(int x)  { return is_uintn(x, 4); }
 static inline bool is_uint5(int x)  { return is_uintn(x, 5); }
 static inline bool is_uint8(int x)  { return is_uintn(x, 8); }
 static inline bool is_uint12(int x)  { return is_uintn(x, 12); }
 static inline bool is_uint16(int x)  { return is_uintn(x, 16); }
 static inline bool is_uint24(int x)  { return is_uintn(x, 24); }
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_